Yeah Tim, I've read that before and I gotta admit that it has always had me a bit confused. I've often wondered if maybe there isn't a typo in there somewhere maybe even in their original research material? I've often wondered if they didn't mean 1-4 WEEKS instead of 1-4 DAYS. I know I've read other material (which unfortunately I can no longer find) that stated that mite eggs can take up to 6 weeks to hatch depending on surrounding temperatures. If mite eggs typically only took 1-4 days to hatch, you wouldn't have so many people (myself included) who had to battle a re-infestation a month or two after their original problem. Of course with the advent of products like P.A.M it kind of makes the whole argument moot because one treatment lasts such a long time. Now you really CAN get rid of a mite infestation in one treatment whereas in the olden days (hehe, I sound like some kind of grandpa) You had to keep retreating every week for months in order to make sure you were mite free.